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MathGroup Archive 2005

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Re: DSolve problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60106] Re: [mg60103] DSolve problem
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 2 Sep 2005 06:37:40 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

You have mixed the variables x and t.  It is not clear what you want.  Here are 
the likely fixes

eqn1=y'[x]==Sin[t]-2y[x];

soln1= DSolve[eqn1,y[x],x][[1,1]]

y[x] -> C[1]/E^(2*x) + Sin[t]/2

eqn1 /. {soln1,D[soln1,x]} // Simplify

True

eqn2 = y'[x]==Sin[x]-2y[x];

soln2 = DSolve[eqn2,y[x],x][[1,1]]

y[x] -> C[1]/E^(2*x) + (1/5)*(2*Sin[x] - Cos[x])

eqn2/. {soln2,D[soln2,x]} // Simplify

True


Bob Hanlon

> 
> From: "sunnewton" <sunshinenewton at gmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/09/02 Fri AM 04:33:05 EDT
> Subject: [mg60106] [mg60103] DSolve problem
> 
> Hi,
> I am a freshman of Mathematica, I need help here...
> 
> I met such problem as:
> 
> DSolve[y'[x] == sin[t] - 2y[x], y[x], t]
> 
> DSolve::"dvnoarg": "The function \!\(y[x]\) appears with no arguments."
> 
> How to Handle???
> 
> 


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